A fork-tine test measures how a loaded pallet bends and holds up while supported on fork tines, the way it is carried by a forklift.
Detailed Definition
In a fork-tine test, a pallet carries a test load while it rests on two fork tines or fork-like supports placed in its openings, and the deflection of the deck and stringers or blocks is measured. The result helps set a safe load for forklift handling. Pallet test standards such as ASTM D1185 and ISO 8611 cover bending under several support conditions, and fork support is one of the conditions pallets are evaluated for. Exact procedures, loads and pass criteria should be taken from the current standard.
Why fork support needs its own rating
A pallet behaves differently depending on what holds it up. On the floor, the whole base carries the load. In a rack, only the edges rest on beams. On forks, two narrow tines carry everything, so the deck outside and between the tines bends and the load position matters. That is why designers look at load capacity separately for floor storage, racking and handling, and why a pallet that is fine on the floor can sag or crack when lifted.
Using fork-tine results as a buyer
- Ask whether a quoted load rating covers fork handling, racking or only floor stacking.
- Ask whether the rating comes from physical testing, design software such as the Pallet Design System, or both.
- Check fork length and spacing in your operation, since short or closely set forks change how the pallet bends.
- Watch for repeated cracking near fork openings, which can signal a design too light for the handling.
What fork-tine results do not tell you
A bending test shows stiffness and strength under a set load, but it does not capture every handling risk. Impact from forks hitting boards, dragging pallets across floors and repeated lifting cycles wear pallets in ways a single static test cannot show. Pallet test standards include separate impact and durability tests for those risks.
Authoritative Sources
- ASTM International (ASTM): the global standards body that publishes ASTM D1185 (Standard Test Methods for Pallets and Related Structures Employed in Materials Handling and Shipping).
- Material Handling Institute (MHI): the largest US trade association for material handling, logistics, and supply chain technologies.
Related Glossary Terms
Frequently Asked Questions
Is a fork-tine test the same as a racking test?
No. Both are bending tests, but the support is different. A racking test supports the pallet on beams at its edges, like selective storage racking, so the pallet spans an open gap. A fork-tine test supports it on two forks inside its openings. Results from one do not predict the other, so a pallet rated for racking may still need checking for fork handling, especially with heavy, dense loads or unusual fork spacing.
Do I need to fork-tine test every pallet design?
Not always. Many common designs are evaluated with pallet design software that models fork, rack and floor support, and that is often enough for routine loads. Physical testing makes more sense for heavy or high value loads, new materials such as plastic or composite pallets, automated systems with tight tolerances, or pallets that keep failing in service. When you do test, follow the current standard method and use samples that match production pallets.